I'm glad I'm not the only one who thought this. Pax know better than us these days.
Depends on the airline.
QF classifies the various electronic items in to categories based on potential impact to flight and nav instruments.
Pretty sure video cameras, digital cameras and a few others (essentially any non transmitting device) can be used at all times (a bit like the old film cameras).
[The only other considerations are high speed projectiles (from a hard short landing perhaps)moving around the cabin - but realistically there's bucket loads of that which is non -electronic carried into the cabin every day]